Well I have done some research and this is what I have come up with.

The 08-09 differential is a FD21A. This differential has a conical spring that applies pressure to the sliding area of the side gear to help engage both wheels at once.

The 2010 has the FD21AT which is a torsen limited slip. From what I can tell that differential should bolt directly into the 08-09, either as the carrier internally or as the whole assembly.

The carrier it self is lists for $3,932.63
The entire differential assembly lists for 4,313.07

What do you guys think is it worth it to you as the customer for me to look into getting them?

 

If you ask me honestly,, forking out approx $5500 installed for a lsd, I might as well trade in my 08 and fork out $15k for a 2010.. its $10k difference, but Im gettin a car thats 2 years newer, no miles, FACTORY WARRANTY from scratch again, and updated navi, etc....

 

I appreciate the info but I tend to agree with IS-Fly... The cost just isn't quite worth it as an upgrade. I'd probably just trade up as well if it meant that much to me.

 

Installation on the whole assembly is 8.5 hours. So doing the whole assembly would be about the same price as it would with the labor for disassembly of the diff it self. Also these are MSRP not what I could offer the piece for. I am just trying to get a feel for what you the customer want. I just found the other thread already talking about this I don't know how I missed it when I looked before. Sorry for the double post.

 

I'd rather have some more power mods that is reliable.

 

its about 4k just for the LSD itself, not including the labor and installation. for me at least, id still stick with my 08. dont see the need to retrofit the LSD in an older F model because it wont be under the factory's warranty. much more peace at mind to get the '10 F if you wanted the LSD that comes under warranty.

 

And I *****ed about spending $2600 for a Strange 12 bolt rear end assembly for my Z28 lol.

 

I agree. Forget about the differential and lets see you focus on your power mod projects.

 

Welcome to CL Andy....!!

Here is a thread with TON'S of helpful info I gathered on LSD's for the IS-F..

First Look: IS-F LSD Swaps w/pics (been happening in Japan)

FYI:

The 2010 Torsen LSD (entire differential unit) Part number is 41110-53290 MSRP is $4,313

I found it online for $3,034..


Regards,

Joe Z

 

"scotty we need more power"

 

Power means nothing if it can't be put to good use @ the Rear Wheels..

joe Z

 

^^^^^
exaclty! there are a bunch if ppl pushin 500hp from nitrous or forced induction, but can't seem to best a 1/4 mile time. I think someone needs to look at our torque converters, or whatever else could cause this.

 

+1

Yeah there does appear to be some kind of issue here. I don't know what the tipping point is, but the cars pushing 500hp on the dyno are just not putting the power down the way they should on the track.

 

mine should be in shortly.. i will post my info on it as its done..

 

I can do the just the 2010 carrier for $2,850 and I can do the whole assemble for $3,100. Now according to my dealer this part should be warrantable if its installed by the dealer.